| 摘要 |
PROBLEM TO BE SOLVED: To provide an effective synchronization control circuit at varying of the number of revolutions of a motor. SOLUTION: This synchronization control circuit is provided with a phase difference detector 9, to which reference frequency signals and the output frequency signals of a motor are input, a pulse generator 10 which is triggered by an output from the phase difference detector 9 and generates pulse signals, a high level detector 13 which detects the high level output of a phase comparator, a low level detector 14 which detects a low level output of the phase comparator, a first switch circuit 11 which is supplied with the output of the pulse generator 10 and controlled by the output of the high level detector 13 and outputs a first synchronization pattern, and a second switch circuit 12 which is supplied with the output of the pulse generator 10 and controlled by the output of the low level detector 14 and outputs a second synchronization pattern. Then a control direct-current voltage based on the synchronization pattern outputs is supplied to a motor driver 6. |
